Motor for actuating lens

Abstract

A lens actuating motor is provided, the lens actuating motor including a first mover arranged at a lateral surface of a lens part to move the lens part, a second mover configured to accommodate the first mover for vertical movement, a stator positioned at a bottom surface of the second mover to horizontally move the second mover and centrally formed with a through hole corresponding to the lens part, and a base including an accommodation lug configured to support the stator and the second mover, centrally formed with a hollow hole corresponding to the through hole of the stator, and inserted into the through hole of the stator by being protruded from an upper surface formed with the hollow hole.

What is claimed is: 
     
       1. A lens actuating motor, the lens actuating motor comprising:
 a first mover comprising a bobbin configured to be coupled with a lens and a first coil arranged at the bobbin to move the lens; 
 a second mover comprising a housing to accommodate the first mover and a magnet arranged at the housing; 
 a stator comprising a second coil positioned to face a bottom surface of the magnet and centrally formed with a first hole and a substrate provided at a lower surface of the second coil and having a second hole corresponding to the first hole, wherein the substrate comprises a flexible printed circuit board (FPCB) having terminal parts disposed on lateral surfaces of the base, and the second coil is coupled to the FPCB and electrically connected to the FPCB to be applied with an electric source through the terminal parts; 
 a Hall sensor part mounted at a lower surface of the FPCB and corresponding to a position of the magnet, wherein the Hall sensor part comprises two Hall sensors configured to detect the displacements of the magnet in directions of x axis and y axis;
 a base positioned under the second coil and centrally formed with a third hole corresponding to the first hole and the second hole of the stator, wherein the base comprises an accommodation lug protrusively formed from an upper surface of the base along the third hole thereof, wherein the base further comprises two Hall sensor accommodation grooves and the two Hall sensors are disposed in the two Hall sensor accommodation grooves, respectively; and 
 
 a cover can mounted at the base to accommodate the first mover, the stator and the second mover, wherein the cover can comprises a metal material, 
 wherein the accommodation lug has a diameter equal to or smaller than a diameter of the first and second holes of the stator and the accommodation lug is configured to be inserted through the first and second holes to couple the stator to the base, 
 wherein the lateral surfaces of the base comprises a first lateral surface and a second lateral surface opposite to the first lateral surface, 
 wherein the terminal parts of the FPCB comprises a first terminal part disposed on the first lateral surface and a second terminal part disposed on the second lateral surface, 
 wherein the first terminal part and the second terminal part are electrically connected to a printed circuit board (PCB) which is connected to an image sensor, and 
 wherein the base performs a sensor holder function to protect the image sensor and is configured to position an infrared (IR) filter. 
 
     
     
       2. The lens actuating motor of  claim 1 , wherein the accommodation lug is integrally formed with the base. 
     
     
       3. The lens actuating motor of  claim 1 , wherein the accommodation lug is formed by protruding in a circular shape. 
     
     
       4. The lens actuating motor of  claim 1 , wherein the accommodation lug is formed by at least two lugs being intermittently formed at an equidistant interval. 
     
     
       5. The lens actuating motor of  claim 1 , wherein an upper surface of the base is formed with at least two adhesion grooves outside the accommodation lug. 
     
     
       6. The lens actuating motor of  claim 1 , wherein the second coil is a fine pattern (FP) coil. 
     
     
       7. The lens actuating motor of  claim 1 , further comprising an elastic unit comprising:
 a lower elastic unit fastened to a lower portion of the bobbin and the housing; 
 an upper elastic unit fastened to an upper portion of the bobbin and the housing; and 
 a lateral elastic unit supporting the housing and electrically connected to the FPCB. 
 
     
     
       8. The lens actuating motor of  claim 7 , wherein at least one of the lower elastic unit, the upper elastic unit, or the lateral elastic unit is a leaf spring. 
     
     
       9. The lens actuating motor of  claim 1 , wherein the cover can is formed with at least one extensively-formed fastening piece at a lower part of a lateral surface thereof, and the base is formed with a fastening groove in which the at least one extensively-formed fastening piece is disposed, and wherein the substrate comprises an opening corresponding to the fastening groove of the base. 
     
     
       10. The lens actuating motor of  claim 1 , wherein the accommodation lug is configured to wrap each an inner surface of the first hole and the second hole of the stator by being inserted into the first and second holes such that a foreign object is inhibited from entering the third hole of the base. 
     
     
       11. The lens actuating motor of  claim 5 , wherein the stator includes a concave groove or a fourth hole formed at a position corresponding to one of the adhesion grooves. 
     
     
       12. The lens actuating motor of  claim 11 , wherein the concave groove or the fourth hole is formed with a diameter greater than a diameter of the corresponding adhesion groove. 
     
     
       13. The lens actuating motor of  claim 1 , wherein the two Hall sensors comprises a first Hall sensor and a second Hall sensor, and wherein the first and second Hall sensors are positioned such that an angle between an imaginary line connecting the first Hall sensor and an optical axis and an imaginary line connecting the second Hall sensor and the optical axis is perpendicular. 
     
     
       14. A camera module having a foreign object prevention structure, the camera module comprising:
 a first mover comprising a bobbin coupled with a lens part and a first coil arranged at the bobbin for moving the lens part; 
 a second mover comprising a housing and a magnet arranged at the housing to accommodate the first mover; 
 a stator positioned under the second mover for horizontally moving the second mover, and centrally formed with a through hole corresponding to the lens part; 
 a base configured to support the stator and the second mover and centrally formed with a hollow hole corresponding to the through hole of the stator; and 
 a foreign object prevention cap configured to be inserted into the through hole of the stator, 
 wherein the foreign object prevention cap comprises a cylindrical part to wrap an inner surface of the through hole of the stator and a flange part extended from an upper surface of the cylindrical part to contact an upper surface of the stator along the through hole thereof, and 
 wherein the flange part is attached to the upper surface of the stator and the cylindrical part is attached to the inner surface of the through hole of the stator and an inner surface of the hollow hole of the base to couple the stator to the base. 
 
     
     
       15. The camera module of  claim 14 , wherein the cylindrical part of the foreign object prevention cap has a diameter equal to or smaller than a diameter of the through hole of the stator and a diameter of the hollow hole of the base. 
     
     
       16. The camera module of  claim 15 , wherein the cylindrical part and the flange part are integrally formed by injection molding. 
     
     
       17. The camera module of  claim 14 , wherein the foreign object prevention cap is attached to the upper surface and the inner surface of the through hole of the stator, and to the inner surface of the hollow hole of the base using an adhesive. 
     
     
       18. A camera module, the camera module comprising:
 a first mover comprising a bobbin configured to be coupled with a lens and a first coil arranged at the bobbin to move the lens; 
 a second mover comprising a housing to accommodate the first mover and a magnet arranged at the housing; 
 a stator comprising a second coil positioned to face a bottom surface of the magnet and centrally formed with a first hole and a substrate provided at a lower surface of the second coil and having a second hole corresponding to the first hole, wherein the substrate comprises a flexible printed circuit board (FPCB) having terminal parts disposed on lateral surfaces of the base, and the second coil is coupled to the FPCB and electrically connected to the FPCB to be applied with an electric source through the terminal parts; 
 a Hall sensor part mounted at a lower surface of the FPCB and corresponding to a position of the magnet, wherein the Hall sensor part comprises two Hall sensors configured to detect the displacements of the magnet in directions of x axis and y axis; 
 a base positioned under the second coil and centrally formed with a third hole corresponding to the first hole and the second hole of the stator, wherein the base comprises an accommodation lug protrusively formed from an upper surface of the base along the third hole thereof, wherein the base further comprises two Hall sensor accommodation grooves and the two Hall sensors are disposed in the two Hall sensor accommodation grooves, respectively; 
 a cover can mounted at the base to accommodate the first mover, the stator and the second mover, wherein the cover can comprises a metal material; 
 an image sensor disposed below the base, and 
 a Printed Circuit Board (PCB) disposed below the image sensor and coupled to the base, wherein the base performs a sensor holder function to protect the image sensor and is configured to position an IR filter, 
 wherein the accommodation lug has a diameter equal to or smaller than a diameter of the first and second holes of the stator and the accommodation lug is configured to be inserted through the first and second holes to couple the stator to the base, 
 wherein the lateral surfaces of the base comprises a first lateral surface and a second lateral surface opposite to the first lateral surface, 
 wherein the terminal parts of the FPCB comprises a first terminal part disposed on the first lateral surface and a second terminal part disposed on the second lateral surface, and 
 wherein the PCB is the first terminal part and the second terminal part. 
 
     
     
       19. A mobile phone comprising the camera module of  claim 18 . 
     
     
       20. The camera module of  claim 18 , wherein the accommodation lug is configured to wrap each an inner surface of the first hole and the second hole of the stator by being inserted into the first and second holes such that a foreign object is inhibited from entering the third hole of the base.